Celestial and 7 ’erfefifid Globes. 275

PROBLEM LIX.

To find naturally the sun’s decli-nation, diurnal parallel, and hisplace thereon.

311. The globe being set upon an hori-zontal plane, and adjusted by a meridianline or otherwise, observe upon which orbetween which polar parallel the term ofillumination falls; its distance from the poleis the degree of the sun's declination : reckonthis distance from the equator among thelarger parallels, and you have the parallelwhich the fun describes that day ; upon whichif you move a card, cut in the form of adouble square, until its lhadow falls underitself, you will obtain the very place uponthat parallel over which the sun is verticalat any hour of that day, if you set the placeyou are in under the graduated side of thestrong brass meridian.

Note, The moon’s declination, diurnalparallel and place, may be found in the famemanner. Likewise when the sun does notshine bright, his declination, &c. May befound by an application in the manner ofproblem 57.

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PROBLEM